This function downloads NARR meteorology data files from the NOAA FTP server
and saves them to a specified folder. Files can be downloaded by specifying a
list of filenames (in the form of "NARR{YYYY}{MM}").
| 1 | get_met_narr(days, duration, direction, path_met_files)
 | 
| days | A vector of days that the model will run. This is combined with
the  | 
| duration | The duration of each model run (whether it is in the forward direction or running backwards) in hours. | 
| direction | An option to select whether to conduct the model in the
 | 
| path_met_files | A full directory path to which the meteorological data files will be saved. | 
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